Combine all ingredients (except lemon) in a cocktail shaker with plenty of ice.
Shake vigorously and double strain into a chilled coupe. Garnish with brûléed lemon slice.
Brûléed lemon
Sprinkle a thinly sliced lemon wheel or wedge with a little sugar on both sides and brûlée with a kitchen torch until golden and starting to char. It adds smokey citrusy notes and serves as a fancy candied garnish. You can also achieve this by placing a lemon slice on a baking sheet 5 inches from the broiler source. The process takes about 1-2 minutes and will caramelize the outside of the lemon.
Notes
Angostura bitters are optional but adds spicy nutmeg notes and create a more well-balanced cocktail.